CN110480006B - Device and method for magnetic pulse bidirectional pressing based on metal matrix composite material - Google Patents

Device and method for magnetic pulse bidirectional pressing based on metal matrix composite material Download PDF

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Publication number
CN110480006B
CN110480006B CN201910875995.9A CN201910875995A CN110480006B CN 110480006 B CN110480006 B CN 110480006B CN 201910875995 A CN201910875995 A CN 201910875995A CN 110480006 B CN110480006 B CN 110480006B
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die
plate
stamping die
pressing
amplifier
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CN110480006A (en
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罗通
董东营
王琼
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Harbin Institute Of Technology Robot (yueyang) Military And Civilian Integration Research Institute
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Harbin Institute Of Technology Robot (yueyang) Military And Civilian Integration Research Institute
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02Compacting only
    • B22F3/03Press-moulding apparatus therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02Compacting only
    • B22F3/087Compacting only using high energy impulses, e.g. magnetic field impulses

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Powder Metallurgy (AREA)

Abstract

A device and a pressing method based on metal matrix composite material magnetic pulse bidirectional pressing are provided. The traditional powder pressing mainly adopts hydraulic pressure, the pressing time is longer, the powder body is easy to produce work hardening, and the density is not high. The invention utilizes two flat coils which are horizontally and symmetrically arranged to discharge simultaneously, and converts the horizontal movement of the driving sheet into the vertical opposite movement of the punch through the wedge block structures at the front end of the amplifier and the two sides of the punching die, thereby realizing the bidirectional pressing of the powder. The stamping die is connected with the screw rod nut through the reset spring and the shaft shoulder screw, the adjusting gear is rotated through the handle, then the vertical screw rod is rotated, the reciprocating motion of the stamping die is realized, and the motion direction of the stamping die is limited by the guide rail. The invention can be used for pressing different metal powder bodies, the diameter of the pressed compact can be realized by changing the central through hole of the die, and the invention has the advantages of large pressing force, uniform density of the pressed compact, realization of accurate regulation and control and the like.

Description

Device and method for magnetic pulse bidirectional pressing based on metal matrix composite material
The technical field is as follows:
the invention belongs to the technical field of powder pressing, and particularly relates to a device and a pressing method based on metal matrix composite material magnetic pulse bidirectional pressing.
Background art:
in modern metallurgical industry, powder metallurgy technology can realize the research and development of high-density, high-precision and high-strength powder metallurgy products, and powder pressing is an important link in powder metallurgy. It is a process for compacting powder into parts or blanks to be sintered with certain shape, size, porosity and strength by the action of external force. The powder pressing process mainly comprises the following steps: loading powder, pressing and demoulding. The technical level of the method determines the precision and compactness of the blank, and further influences the final performance of the part. Common forming modes comprise slip casting, compression molding, hot press forming, isostatic pressing and the like, which can prepare parts with certain sizes, but the forming modes have low efficiency, high cost, complex equipment operation and gradient density of prepared blanks.
The traditional powder pressing mainly adopts hydraulic pressure, the pressing time is longer, the powder body is easy to produce work hardening, and the density is not high. The magnetic pulse powder pressing takes electromagnetic force as driving force, the pressing time is short (millisecond level), the pressing speed is high (meter/second), the work hardening effect of the powder body is small, and high-speed compact can be realized. Compared with the traditional powder pressing, the electromagnetic pressing is controlled by a circuit, the accurate adjustment of the discharge energy can be realized, the safety and stability are realized, the efficiency is high, and the automatic control can be realized.
In a patent document with the title "a method and apparatus for powder compaction by radial and axial electromagnetic force", publication No. CN108057883A, a method is proposed in which a solenoid coil and a flat coil work together to compact a powder body radially and axially. In "a method of high-speed impact compaction of metal powder", patent document CN101823146B, a method of compacting powder by electromagnetic driving using a tower-shaped coil is proposed. However, in the above patent, after the powder body is pressed, the density of the green compact is graded in the axial direction. However, both of these patents are uni-directional compaction, and the compacted powder is not very dense.
The invention content is as follows:
the invention aims to provide a device and a method for magnetic pulse bidirectional pressing based on a metal matrix composite.
The above purpose is realized by the following technical scheme:
a device based on metal matrix composite magnetic pulse bidirectional pressing comprises a bottom plate, wherein the lower surface of the bottom plate is connected with a square pipe, and the upper surface of the bottom plate is connected with a lower backing plate and 2 vertical plates;
the inner side surface of the vertical plate is respectively connected with one end of a steel sleeve, the other end of the steel sleeve is connected with a limiting plate, an upper padding plate is arranged at the upper part of the vertical plate, a horizontal screw rod is arranged on the vertical plate, the inner wall of the steel sleeve is embedded into an insulating sleeve, and a pushing plate, an insulating plate, a coil holder, a flat coil, a driving sheet and an amplifier are sequentially arranged in the insulating sleeve; the propulsion plate is in opposite contact with the horizontal lead screw, the insulating plate is connected with the coil holder, the driving sheet is connected with the amplifier, and the amplifier is provided with a wedge-shaped groove; 2 the flat coils are connected with a power supply system;
2 vertically corresponding stamping dies are respectively connected with the upper backing plate and the lower backing plate, wedge-shaped blocks are arranged on two sides of each stamping die, and the stamping dies are respectively limited by guide rails; the stamping die is provided with a resetting mechanism; the end face of the stamping die is in threaded connection with a punch; and the upper part of the stamping die arranged on the lower backing plate is fixed with a die through a die clamp.
According to the device for the magnetic pulse bidirectional pressing based on the metal matrix composite, the power supply system consists of a rectifier, a resistor, a double-control switch, a transformer and a capacitor, and a secondary coil of the transformer is connected with the rectifier, the resistor and the capacitor in series; when the double-control switch is in an open state during charging, the capacitor is charged at the moment, and when the double-control switch is in a closed state during discharging, the capacitor is discharged, so that the flat coil is electrified to generate electromagnetic force.
The device for the magnetic pulse bidirectional pressing based on the metal matrix composite comprises a reset mechanism, a control mechanism and a control mechanism, wherein the reset mechanism consists of a shaft shoulder screw, a reset spring and a screw rod nut; the handle is rotated, the adjusting gear drives the vertical screw rod to rotate, and then the screw rod nut drives the stamping die to move up and down; when discharging, the screw rod nut is fixed, the amplifier drives the punch to press the powder body through the wedge-shaped block mechanism, the reset spring is compressed at the moment, and after discharging, the punching die drives the punch to be separated from the cylindrical cushion block under the tension action of the reset spring, so that resetting is realized.
In the device for magnetic pulse bidirectional pressing based on the metal matrix composite, 2 wedge-shaped grooves are formed in the upper end face of the amplifier and used for accommodating wedge blocks on two sides of the stamping die and converting the horizontal movement of the driving sheet into the vertical opposite movement of the stamping die; the motion of the amplifier is limited by a limiting plate.
According to the device for the magnetic pulse bidirectional pressing based on the metal matrix composite, a threaded hole is formed in the upper end face of the stamping die and used for fixing a screw; the lower end face of the stamping die is provided with a threaded hole for fixing a punch; the moving direction of the stamping die is limited by a guide rail connected with the upper backing plate and the lower backing plate.
A pressing method using the apparatus for magnetic pulse bidirectional pressing based on metal matrix composite material according to any one of claims 1 to 5, comprising the steps of:
step 1, putting a powder body into a die, and vertically placing cylindrical cushion blocks on the powder body to transfer load;
step 2, rotating the first handle to enable the two screw rod nuts to rotate oppositely, further driving the stamping dies to move oppositely, enabling the upper and lower punches to be in contact with the cylindrical cushion block, and preliminarily compacting the powder body;
step 3, rotating the second handle to rotate the horizontal screw rod, then moving the pushing plate forwards, further moving the insulating plate, the coil seat, the flat coil, the driving sheet and the amplifier forwards, keeping the parts tightly attached, and enabling the inclined plane of the concave wedge-shaped groove of the amplifier to be in contact with the inclined planes of the wedge blocks at the two sides of the stamping die;
step 4, after the alternating voltage passes through the transformer, the capacitor is charged, and the voltage can be changed according to the performance of the pressed powder body and the experimental requirements;
step 5, closing the double-control switch, discharging a capacitor, generating an induction magnetic field in the flat coil due to the change of current, exciting another induction magnetic field in the driving sheet by the induction magnetic field, pushing the driving sheet and the amplifier to move horizontally forward by the strong repulsive force between the two magnetic fields, and enabling the two punching dies to move oppositely by the wedge-shaped block mechanism to apply force to the punch head so as to realize the bidirectional pressing of the magnetic pulse powder;
step 6, after the discharge is finished, under the action of a return spring, separating the punch from the cylindrical cushion block;
step 7, rotating the handle to enable the two screw rod nuts to rotate reversely so as to drive the punching die to move reversely, increasing the distance between the punch and the die, and taking out the die;
and 8, demolding the powder body after the pressing is finished, taking out the pressed blank, finishing the magnetic pulse bidirectional pressing process, and finishing the experimental instrument.
Has the advantages that:
the invention relates to a forming method which uses an instant high-voltage pulse magnetic field to force a powder body to be formed at a high speed under the action of impact electromagnetic force. The electromagnetic force is provided by two flat coil that the level was placed, and the powder body is located two flat coil intermediate positions, and the powder body is the press die of the guide rail limited movement direction from top to bottom, and when the coil circular telegram, the wedge of press die both sides turned into the vertical relative motion of drift with the horizontal motion of driving plate, realizes then the two-way suppression to the powder body. Compared with explosion forming and electro-hydraulic forming, electromagnetic forming is safer and more convenient, and can be widely applied to the fields of machinery, electronics, automobile industry and the like.
The invention uses two flat coils to charge and discharge simultaneously, so that the pressing force of magnetic pulse powder pressing is larger than that of the prior art; the pressing effect under the previous larger discharge voltage can be achieved under the smaller discharge voltage; the efficiency is higher, and the density of the prepared powder green body is more uniform.
The invention uses a wedge-shaped block mechanism to convert horizontal electromagnetic force into vertical pressing force, has simple structure and high conversion efficiency and realizes the efficient utilization of the electromagnetic force.
The reciprocating motion of the stamping die is effectively realized by using the screw rod and nut mechanism; the reset spring is connected with the stamping die, the lead screw nut and the shaft shoulder screw, so that the stamping die can automatically reset after discharging is finished.
The diameter of the through hole of the die is changed, so that pressed blanks with different height-diameter ratios can be pressed; and powder compaction of harder materials can also be performed due to bi-directional compaction.
Description of the drawings:
figure 1 is a perspective view of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a sectional view a-a of fig. 2.
FIG. 4 is a schematic structural view of a press die of the present invention.
Fig. 5 is a schematic structural diagram of the reset mechanism of the present invention.
Fig. 6 is a schematic diagram of the structure of the amplifier of the present invention.
FIG. 7 is a schematic view of the structure of the mold clamp of the present invention.
Fig. 8 is a schematic structural diagram of a flat coil and a coil holder according to the present invention.
Fig. 9 is a schematic structural view of a feed screw nut of the present invention.
Fig. 10 is a schematic view of the structure of the adjusting gear device.
Fig. 11 is a perspective view of the apparatus of the present invention prior to powder compaction.
FIG. 12 is a schematic diagram of the construction of the apparatus of the present invention prior to powder compaction.
Fig. 13 is a sectional view B-B of fig. 2.
Fig. 14 is a perspective view of the apparatus of the present invention after powder compaction.
FIG. 15 is a schematic diagram of the apparatus of the present invention after powder compaction.
Fig. 16 is a cross-sectional view taken along line C-C of fig. 2.
In the figure: 1: square tube, 2: bottom plate, 3: lower bolster, 4: a vertical plate, 5: rigid sleeve, 6: insulating sleeve, 7: thrust plate, 8: insulating plate, 9: coil holder, 10: plate coil, 11: driving piece, 12: an amplifier, 13: horizontal screw, 14: upper pad, 15: adjusting gear, 16: handle one, 17: guide rail, 18: shoulder screw, 19: return spring, 20: feed screw nut, 21: stamping die, 22: punch, 23: vertical screw, 24: mold, 25: mold clamp, 26: a limit plate, 27: double control switch, 28: capacitance, 29: resistance, 30: rectifier, 31: transformer, 32: cylindrical cushion block, 33: powder body before compression, 34: compressed powder body, 35: a second handle 36 is a return spring after compression.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1-3, the illustration shows a device based on metal matrix composite magnetic pulse bidirectional pressing, which includes a square tube 1, a bottom plate 2, a lower backing plate 3, a vertical plate 4, a rigid sleeve 5, an insulating sleeve 6, a pushing plate 7, an insulating plate 8, a coil holder 9, a flat coil 10, a driving sheet 11, an amplifier 12, a horizontal lead screw 13, an upper backing plate 14, an adjusting gear 15, a first handle 16, a guide rail 17, a shoulder screw 18, a return spring 19, a lead screw nut 20, a stamping die 21, a punch 22, a vertical lead screw 23, a die 24, a die clamp 25, a limiting plate 26, a double control switch 27, a capacitor 28, a resistor 29, a rectifier 30, a transformer 31, and a second handle 36.
Specifically, as shown in fig. 2 and 3, 6 square pipes 1 are distributed and welded on the lower surface of a bottom plate 2 to support the whole device; two sides of the upper surface of the vertical plate are provided with 10 threaded holes with the size of M10 for fixing the vertical plate 4; the upper surface of the bottom plate 2 is provided with 2 threaded holes with the size of M6 at the opposite corners for fixing the lower backing plate 3.
The side surface of the vertical plate 4 is provided with 8 threaded holes with the size of M10 for fixing the steel sleeve 5; the upper end surface of the upper cushion plate is provided with 4 threaded holes with the size of M6 for fixing the upper cushion plate 14; the middle of the vertical plate 4 is provided with a threaded hole with the size of M90 for accommodating the horizontal lead screw 13.
An insulating sleeve 6 is embedded in the inner wall of the steel sleeve 5, the insulating sleeve 6 is fixed on the steel sleeve 5 through a screw with the size of M5, and rectangular grooves are formed in one side of each of the two sleeves so that copper wires can be connected with an external circuit; a propulsion plate 7, an insulation plate 8, a coil holder 9, a flat coil 10, a driving sheet 11 and an amplifier 12 are sequentially arranged in the insulation sleeve 6, and all the components are tightly attached; the pushing plate 7 is in direct contact with the horizontal lead screw 13, the insulating plate 8 is connected with the coil base 9 through a screw with the size of M6, and the driving piece 11 is connected with the amplifier 12 through a screw with the size of M6.
The flat coil 10 is formed by winding a copper strip with a section of 3.5mm multiplied by 15mm, the number of turns is 30, the copper strip is insulated by an insulating tape, and the outer side of the copper strip is coated with epoxy resin and a coagulant to be fixed on the coil base 9. The coil base 9 is provided with a guide hole for connecting the coil with an external circuit. Specifically, the flat coil 10 is shown in fig. 8.
The driving plate 11 is made of a high conductivity material, such as pure copper, pure aluminum, etc.
The upper end face of the amplifier 12 is provided with 2 concave wedge-shaped grooves with the size of 35mm multiplied by 40mm for accommodating wedge blocks at two sides of the stamping die 21 and converting the horizontal movement of the driving plate 11 into the vertical opposite movement of the stamping die 21. The movement of the amplifier 12 is limited by a limit plate 26. Specifically, the amplifier 12 is shown in fig. 6.
The insulating sleeve 6, the insulating plate 8 and the coil base 9 are made of insulating materials, such as epoxy resin, glass fiber and the like.
The stamping die 21 is limited by the guide rail 17 and can only move up and down; the upper end face of the stamping die 21 is provided with a threaded hole with the size of 15mm for fixing the shaft shoulder screw 18; a return spring 19 is arranged between the shaft shoulder screw 18 and the feed screw nut 20; the lower end face of the punching die 21 is provided with a threaded hole of size M30 for fixing the punch 22. The specific stamping die 21 and reset mechanism is shown in fig. 4-5.
The punch 22 should have good wear resistance, high strength, and be made of alloy steel or the like.
The guide rail 17 is connected with the lower cushion plate 3 through a screw with the size of M6; the upper end surface of the die holder is provided with a threaded hole with the size of M6 for fixing the die holder 25; the middle of the guide rail 17 is provided with a rectangular through hole for placing a screw nut 20.
The diameters of the two sides of the vertical screw rod 23 are 30mm, and the upper cushion plate 14 and the lower cushion plate 3 are limited through coaxial through holes; the upper end of the vertical screw rod 23 is meshed with the adjusting gear 15; when the first handle 16 is rotated, the central adjusting gear 15 starts to rotate, so that the adjusting gear 15 meshed with the vertical screw 23 rotates, the screw nut 20 rotates, and the reset spring 19 drives the stamping die 21 to move up and down.
The center of the die clamp 25 is provided with a through hole with the size of 50mm, and on the basis, a round hole with the size of 55mm is coaxially formed to form a stepped hole for placing the die 24. Specifically, the mold clamp 25 is shown in fig. 7.
The die 24 is made of high-strength steel, and a through hole with the size of 20mm is formed in the die 24 so as to place a powder body; the diameter of the through hole can be changed according to the diameter of the desired compact.
The two horizontally placed flat coils 10 are connected with the same power supply system and are charged and discharged simultaneously.
The power supply system consists of a rectifier 30, a resistor 29, a double-control switch 27, a transformer 31 and a capacitor 28, wherein a secondary coil of the transformer is connected with the rectifier 30, the resistor 29 and the capacitor 28 in series; during charging, the dual-control switch 27 is in an open state, the capacitor 28 is charged at the time, and during discharging, the dual-control switch 27 is in a closed state, the capacitor 28 is discharged, and further the flat coil 10 is electrified to generate electromagnetic force.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (6)

1. The utility model provides a device based on two-way suppression of metal matrix composite magnetic pulse which characterized by: the lower surface of the bottom plate is connected with a square tube, and the upper surface of the bottom plate is connected with a lower backing plate and 2 vertical plates;
the inner side surface of the vertical plate is respectively connected with one end of a steel sleeve, the other end of the steel sleeve is connected with a limiting plate, an upper padding plate is arranged at the upper part of the vertical plate, a horizontal screw rod is arranged on the vertical plate, the inner wall of the steel sleeve is embedded into an insulating sleeve, and a pushing plate, an insulating plate, a coil holder, a flat coil, a driving sheet and an amplifier are sequentially arranged in the insulating sleeve; the propulsion plate is in opposite contact with the horizontal lead screw, the insulating plate is connected with the coil holder, the driving sheet is connected with the amplifier, and the amplifier is provided with a wedge-shaped groove; 2 the flat coils are connected with a power supply system;
2 vertically corresponding stamping dies are respectively connected with the upper backing plate and the lower backing plate, wedge-shaped blocks are arranged on two sides of each stamping die, and the stamping dies are respectively limited by guide rails; the stamping die is provided with a resetting mechanism; the end face of the stamping die is in threaded connection with a punch; and the upper part of the stamping die arranged on the lower backing plate is fixed with a die through a die clamp.
2. The apparatus according to claim 1, wherein the apparatus comprises: the power supply system consists of a rectifier, a resistor, a double-control switch, a transformer and a capacitor, wherein a secondary coil of the transformer is connected with the rectifier, the resistor and the capacitor in series; when the double-control switch is in an open state during charging, the capacitor is charged at the moment, and when the double-control switch is in a closed state during discharging, the capacitor is discharged, so that the flat coil is electrified to generate electromagnetic force.
3. The apparatus according to claim 2, wherein the apparatus comprises: the reset mechanism consists of a shaft shoulder screw, a reset spring and a screw nut; rotating the first handle, driving the vertical screw rod to rotate by the adjusting gear, and driving the stamping die to move up and down by the screw rod nut; when discharging, the screw rod nut is fixed, the amplifier drives the punch to press the powder body through the wedge-shaped block mechanism, the reset spring is compressed at the moment, and after discharging, the punching die drives the punch to be separated from the cylindrical cushion block under the tension action of the reset spring, so that resetting is realized.
4. The apparatus according to claim 3, wherein the apparatus comprises: 2 wedge-shaped grooves are formed in the upper end face of the amplifier and used for accommodating wedge blocks on two sides of the stamping die and converting horizontal movement of the driving sheet into vertical opposite movement of the stamping die; the motion of the amplifier is limited by a limiting plate.
5. The apparatus according to claim 4, wherein the apparatus comprises: the upper end surface of the stamping die is provided with a threaded hole for fixing a screw; the lower end face of the stamping die is provided with a threaded hole for fixing a punch; the moving direction of the stamping die is limited by a guide rail connected with the upper backing plate and the lower backing plate.
6. A pressing method using the apparatus for magnetic pulse bidirectional pressing based on metal matrix composite material according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
step 1, putting a powder body into a die, and vertically placing cylindrical cushion blocks on the powder body to transfer load;
step 2, rotating the first handle to enable the two screw rod nuts to rotate oppositely, further driving the stamping dies to move oppositely, enabling the upper and lower punches to be in contact with the cylindrical cushion block, and preliminarily compacting the powder body;
step 3, rotating the second handle to rotate the horizontal screw rod, then moving the pushing plate forwards, further moving the insulating plate, the coil seat, the flat coil, the driving sheet and the amplifier forwards, keeping the parts tightly attached, and enabling the inclined plane of the concave wedge-shaped groove of the amplifier to be in contact with the inclined planes of the wedge blocks at the two sides of the stamping die;
step 4, after the alternating voltage passes through the transformer, the capacitor is charged, and the voltage can be changed according to the performance of the pressed powder body and the experimental requirements;
step 5, closing the double-control switch, discharging a capacitor, generating an induction magnetic field in the flat coil due to the change of current, exciting another induction magnetic field in the driving sheet by the induction magnetic field, pushing the driving sheet and the amplifier to move horizontally forward by the strong repulsive force between the two magnetic fields, and enabling the two punching dies to move oppositely by the wedge-shaped block mechanism to apply force to the punch head so as to realize the bidirectional pressing of the magnetic pulse powder;
step 6, after the discharge is finished, under the action of a return spring, separating the punch from the cylindrical cushion block;
step 7, rotating the handle to enable the two screw rod nuts to rotate reversely so as to drive the punching die to move reversely, increasing the distance between the punch and the die, and taking out the die;
and 8, demolding the powder body after the pressing is finished, taking out the pressed blank, finishing the magnetic pulse bidirectional pressing process, and finishing the experimental instrument.
CN201910875995.9A 2019-09-17 2019-09-17 Device and method for magnetic pulse bidirectional pressing based on metal matrix composite material Active CN110480006B (en)

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